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Open AccessArticle

Low Weight Hollow Microspheres of Iron with Thin Dielectric Coating: Synthesis and Microwave Permeability

1
Institute for Theoretical and Applied Electromagnetics RAS, Moscow 125412, Russia
2
Faculty of Chemistry, Wroclaw University of Science and Technology, 50-373 Wroclaw, Poland
3
College of New Materials and Nanotechnologies, National University of Science and Technology MISIS, Moscow 119049, Russia
4
Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
5
School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(10), 995; https://doi.org/10.3390/coatings10100995
Received: 14 September 2020 / Revised: 15 October 2020 / Accepted: 16 October 2020 / Published: 18 October 2020
(This article belongs to the Special Issue Functional Nanofilms: From Fundamentals to Applications)
Spray pyrolysis of an aqueous solution of iron nitrate, proceeded with reduction of the product in hydrogen, gave iron powder with micron-sized hollow particles. Coating these iron particles with SiO2 through tetraethyl orthosilicate hydrolysis prevented interparticle electrical contacts and suppressed DC percolation. This material shows a high ferromagnetic resonance frequency of 18 GHz, low permittivity, and weighs 20% less than common carbonyl iron. Potential microwave applications are for inductors and electromagnetic interference shielding designs. View Full-Text
Keywords: hollow iron microspheres particles; spray pyrolysis; core-shell; [email protected]2; Stöber process; magnetic hysteresis; microwave permeability hollow iron microspheres particles; spray pyrolysis; core-shell; [email protected]2; Stöber process; magnetic hysteresis; microwave permeability
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Kosevich, A.; Petrusevich, E.; Maklakov, S.; Naboko, A.; Kolesnikov, E.; Petrov, D.; Zezyulina, P.; Pokholok, K.; Filimonov, D.; Han, M. Low Weight Hollow Microspheres of Iron with Thin Dielectric Coating: Synthesis and Microwave Permeability. Coatings 2020, 10, 995.

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